==== tests/cases/conformance/classes/constructorDeclarations/constructorParameters/constructorParameterProperties2.ts (2 errors) ====
    class C {
        y: number;
        constructor(y: number) { } // ok
    }
    
    var c: C;
    var r = c.y;
    
    class D {
        y: number;
        constructor(public y: number) { } // error
                           ~
!!! Duplicate identifier 'y'.
    }
    
    var d: D;
    var r2 = d.y;
    
    class E {
        y: number;
        constructor(private y: number) { } // error
                            ~
!!! Duplicate identifier 'y'.
    }
    
    var e: E;
    var r3 = e.y; // error